This version (29 Jun 2021 10:27) was approved by Antoniu Miclaus.

ADRF6780 5.9 GHz to 23.6 GHz, Wideband, Microwave Upconverter

Supported Devices

ADRF6780

Evaluation Boards

EVAL-ADRF6780

Description

This is a Linux industrial I/O (IIO) subsystem driver, targeting serial interface Microwave converters. The industrial I/O subsystem provides a unified framework for drivers for many different types of converters and sensors using a number of different physical interfaces (i2c, spi, etc). See IIO for more information.

Source Code

Status

Source	Mainlined?
git	WIP

Files

Function	File
driver	drivers/iio/frequency/adrf6780.c
Documentation	Documentation/ABI/testing/sysfs-bus-iio

Declaring SPI slave devices

Unlike PCI or USB devices, SPI devices are not enumerated at the hardware level. Instead, the software must know which devices are connected on each SPI bus segment, and what slave selects these devices are using. For this reason, the kernel code must instantiate SPI devices explicitly. The most common method is to declare the SPI devices by bus number.

This method is appropriate when the SPI bus is a system bus, as in many embedded systems, wherein each SPI bus has a number which is known in advance. It is thus possible to pre-declare the SPI devices that inhabit this bus. This is done with an array of struct spi_board_info, which is registered by calling spi_register_board_info().

For more information see: Documentation/spi/spi-summary.rst

21 Oct 2010 16:10

properties

compatible:

enum:
- adi,adrf6780

reg:

maxItems: 1

spi-max-frequency:

minimum: 1000000

clocks:

description: Definition of the external clock (see clock/clock-bindings.txt)
minItems: 1

clock-names:

description: Must be “lo_in”
maxItems: 1

clock-output-names:

maxItems: 1

adi,parity-en:

description: Enable Parity for Write execution.
type: boolean

adi,vga-buff-en:

description: VGA Buffer Enable.
type: boolean

adi,det-en:

description: Detector Enable.
type: boolean

adi,lo-buff-en:

description: LO Buffer Enable.
type: boolean

adi,if-mode-en:

description: IF Mode Enable.
type: boolean

adi,iq-mode-en:

description: IQ Mode Enable.
type: boolean

adi,lo-x2-en:

description: LO x2 Enable.
type: boolean

adi,lo-ppf-en:

description: LO x1 Enable.
type: boolean

adi,lo-en:

description: LO Enable.
type: boolean

adi,uc-bias-en:

description: UC Bias Enable.
type: boolean

adi,lo-sideband:

description: Switch to the Other LO Sideband.
type: boolean

adi,vdet-out-en:

description: VDET Output Select Enable.
type: boolean

'#address-cells':

const: 1

'#size-cells':

const: 0

'#clock-cells':

const: 0

required:

compatible
reg
clocks
clock-names

Example

spi {
      spi {
      #address-cells = <1>;
      #size-cells = <0>;
      adrf6780@0{
        compatible = "adi,adrf6780";
        reg = <0>;
        spi-max-frequency = <1000000>;
        clocks = <&adrf6780_lo>;
        clock-names = "lo_in";
        adi,parity-en;
      };
    };

Adding Linux driver support

Configure kernel with “make menuconfig” (alternatively use “make xconfig” or “make qconfig”)

The ADRF6780 Driver depends on CONFIG_SPI

Linux Kernel Configuration
	Device Drivers  --->
		<*>     Industrial I/O support --->
		    --- Industrial I/O support
				Frequency  --->
					<*> Analog Devices ADRF6780 Microwave Upconverter

Hardware configuration

Each and every IIO device, typically a hardware chip, has a device folder under /sys/bus/iio/devices/iio:deviceX. Where X is the IIO index of the device. Under every of these directory folders reside a set of files, depending on the characteristics and features of the hardware device in question. These files are consistently generalized and documented in the IIO ABI documentation. In order to determine which IIO deviceX corresponds to which hardware device, the user can read the name file /sys/bus/iio/devices/iio:deviceX/name. In case the sequence in which the iio device drivers are loaded/registered is constant, the numbering is constant and may be known in advance.

02 Mar 2011 15:16